Transistors and Applications MCQs

Question 1

The primary function of the bias circuit is to

Accepted Answer

hold the circuit stable at the designed Q-point

Answer

hold the circuit stable at VCC

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hold the circuit stable at vin

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ensure proper gain is achieved

Question 2

The capacitor that produces an ac ground is called a(n)

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bypass capacitor

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coupling capacitor

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dc open

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ac open

Question 3

In a class B push-pull amplifier, the transistors are biased slightly above cutoff to avoid

Accepted Answer

crossover distortion

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unusually high efficiency

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negative feedback

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a low input impedance

Question 4

The depletion-mode MOSFET

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can operate with positive as well as negative gate voltages

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can operate with only positive gate voltages

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can operate with only negative gate voltages

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cannot operate in the ohmic region

Question 5

Three different points are shown on a dc load line. The upper point represents the

Accepted Answer

saturation point

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minimum current gain

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quiescent point

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cutoff point

Question 6

Which of the following conditions are needed to properly bias an npn transistor amplifier?

Accepted Answer

Forward bias the base/emitter junction and reverse bias the base/collector junction.

Answer

Forward bias the collector/base junction and reverse bias the emitter/base junction.

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Apply a positive voltage on the n-type material and a negative voltage on the p-type material.

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Apply a large voltage on the base.

Question 7

Often a common-collector will be the last stage before the load; the main function of this stage is to

Accepted Answer

buffer the voltage amplifiers from the low-resistance load

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provide voltage gain

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provide phase inversion

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provide a high-frequency path to improve the frequency response

Question 8

In order for feedback oscillators to have any practical value, the gain has to be

Accepted Answer

self-adjusting

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< 1

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stabilized

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nonlinear

Question 9

To get a negative gate-source voltage in a self-biased JFET circuit, you must use a

Accepted Answer

source resistor

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voltage divider

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ground

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negative gate supply voltage